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How to use both Display layers on STM32F469NI?

Question asked by lambert.alexander on Jul 5, 2016
I have the following problem: I want to use the background layer to display a background and the foreground layer to place lines above it, so that I can delete the lines without doing anything to the background. There are the function BSP_LCD_LayerDefaultInit(LayerIndex, FB_Address) and  BSP_LCD_SelectLayer(LayerIndex) but if I select the second layer nothing can be displayed. I am using the Address 0xC0000000 and Index 0 for the background layer (wdoes works) and Address 0xC0400000 and Index 1 for the foreground layer (does not work). The Addresses are taken from a datasheet of this board.
I don't know if I am doing something wrong of if this a bug like that one with the portrait mode.

Note: I am programming over

I would be glad if anyone could help me.